HP Scitex LX850 HP Scitex LX850 & LX820 Printers: Maintenance and troubles - Page 29

4 Hardware maintenance Maintain the ink cartridges During the normal lifetime of a cartridge, no specific maintenance is required. However, in order to maintain the best print quality, replace a cartridge when it reaches its expiration date. An alert notifies you when any cartridge reaches its expiration date. You can also check a cartridge's expiration date at any time: see Check printer status on page 7. Maintain the printheads To maintain the best print quality, replace a printhead when it reaches its expiration date. An alert notifies you when any printhead reaches its expiration date. You can also check a printhead's expiration date at any time: see Check printer status on page 7. Printheads should be cleaned and aligned from time to time: see Clean the printheads on page 33 and Align the printheads on page 9. To check the printheads for blocked nozzles, see Check the printheads on page 24. TIP: If you remove an unexpired printhead from the printer, planning to reuse it later, the best way to protect it is by replacing the protective caps that you removed before inserting it into the printer. Maintain the substrates Keep substrates in their sealed wrapping material while they are in storage, and store rolls vertically to avoid the migration of plasticizers in some materials. Move substrates from the storage area to the print production area at least 24 hours before use, so that they can adapt to its temperature and humidity. Maintain hardware ENWW Maintain the ink cartridges 23